Shawn Levy, director of last year’s mega-hit “Night at the Museum,” starring Ben Stiller, is starting production on a new movie that’s a little less ambitious. “The Way Back” is a coming-of-age story about a 15-year-old boy’s summer at a beach house with his family. Levy’s previous credits include “The Pink Panther” and “Cheaper by the Dozen.” “Night at the Museum” has earned more than $570 million worldwide.